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Russell fault: early strike-slip fault of California Coast Ranges

Journal Article · · AAPG Bulletin (American Association of Petroleum Geologists); (USA)
OSTI ID:5535768
The subsurface Russell fault is a controlling structure for oil fields in the Cuyama basin in the southern Salinian block of coastal California. Movement on the Russell fault began at about 23 Ma following deposition of the Oligocene Simmler Formation in extensional basins bounded on the south by normal-fault ancestors of the La Panza and Ozena reverse faults. Right-lateral strike slip on the Russell fault began with deposition of the Soda Lake Shale Member of the Vaqueros Formation. The Soda Lake Shale Member and Painted Rock Sandstone Member of the Vaqueros Formation were deposited in west-trending, right-stepping troughs, while most of the right slip on the Russell fault accumulated 23-19 Ma. Pre-Vaqueros strata are offset 26-29 km, but Vaqueros isopachs are offset only 3.7 km. The Whiterock Bluff Shale Member of the Monterey Formation is dated as 16.5-14 Ma; the facies boundary between the Whiterock Bluff Shale Member and the Branch Canyon Sandstone is offset 3-3.4 km. Coeval subsidiary faults near the Russell fault in Miocene strata at least as young as 11 Ma also support distributed right-lateral shear. 9 figs.
OSTI ID:
5535768
Journal Information:
AAPG Bulletin (American Association of Petroleum Geologists); (USA), Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (USA) Vol. 73:9; ISSN AABUD; ISSN 0149-1423
Country of Publication:
United States
Language:
English